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handheld gps forumThe GPS or Global Positioning System is a global navigation system used for military and civilian applications alike.
In late 2005, the US government introduced the first in a series of new generation GPS staellites offering new capabilities. Chief among these is a second civilian GPS signal called L2C for greater accuracy and reliability. In early years, the US military made the civilian application purposefully less powerful than it could. But since August 2000, the GPS civilian application provides the accuracy of GPS signals to within 2 meters (6 ft). Fact is, GPS accuracy can be improved further, to about 1 cm (half an inch) over short distances, using techniques such as Differential GPS (DGPS). The US military has developed the ability to locally deny GPS (and other navigation services) to hostile forces in a specific area of crisis without affecting the rest of the world or its own military systems. Such Navigation Warfare uses techniques such as local jamming to replace the blunt, world-wide degradation of civilian GPS service that SA represented. The United States Department of Defense developed the system, officially named NAVSTAR GPS (Navigation Signal Timing and Ranging GPS), and the satellites are managed by the 50th Space Wing at Schriever Air Force Base. Although the cost of maintaining the system is significant, GPS is available for free use in civilian and commercial applications. GPS signals can also be affected by multipath reflections of the radio signals off the ground and/or surrounding structures (buildings, canyon walls, etc). For long delay multipath signals, the receiver itself can filter the signals out. A variety of receiver techniques, most notably Narrow Correlator spacing, have been developed to mitigate multipath errors. When it was first deployed, GPS included a feature called Selective Availability (or SA) that introduced intentional errors of up to a hundred meters into the publicly available navigation signals, making it difficult to use for guiding long range missiles to precise targets. Additional accuracy was available in the signal, but in an encrypted form that was only available to the United States military, its allies and a few others, mostly government users. The most recent launch was in September 2005. The oldest GPS satellite still in operation was launched in February 1989. The first experimental Block-I GPS satellite was launched in February 1978. The GPS satellites were initially manufactured by Rockwell International and now manufactured by Lockheed Martin.
1. Handheld GPS
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Handheld GPS units are a perfect companion when you're outdoors hiking, hunting, fishing, geocaching or camping. 27. What is the best hand-held GPS for sailing [Archive ... [Archive] What is the best hand-held GPS for sailing Garmin GPS Mapping Receivers 28. Handheld GPS ???? - BoatingABC.com Boating Message Forum - Boating Message Board that promotes the Boating Lifestyle. ... Im looking for a handheld gps. I only boat in familiar lakes for the most part and really ... 29. Handheld GPS - iboats.com Save more on your boating parts - Handheld GPS - Fast shipping, most in-stock products, over 903,876 boat supplies sold since 1999. Rated Forbes Favorite online ... 30. [WTB] Inexpensive GPS - dslreports.com [WTB] Inexpensive GPS - forum topic ... [WTB] Inexpensive GPS. I want to buy an inexpensive (less than $60) hand-held GPS for use in Geochaching. to forum · · 2009-08-19 ... 31. Geocaching > Getting Started with Geocaching > Guide to ... 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